Not sure I'd call it terrifying, since I don't think it's actually ever happened.
Maybe this came from a near-miss, where some of the circumstances occurred to risk it happening, and disaster was averted. Or maybe it came up in a periodic safety review.
But the reason that flying is safer than almost any other form of transport is that aviation generally learns from its near-misses, as well as its disasters.
I heard an interview with a pilot who said that he sometimes has to report a couple of incidents a month to regulators. I don't know if that's because he's particularly conscientious or it's normal. But mostly these are minor incidents that they can log, and if something is happening a lot, then they can look at changing procedures in order to correct the issue.